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If x=2cos^(-1)(1/2)+sin^(-1)(1/(sqrt(2))...

If `x=2cos^(-1)(1/2)+sin^(-1)(1/(sqrt(2)))+tan^(-1)(sqrt(3))\ a n d\ y=cos(1/2sin^(-1)(sin(x/2)))` then which of the following statement holds good? a. `y=cos((3pi)/16)` b. `y=cos((5pi)/16)` c. `x=4cos^(-1)y` d. none of these

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